Pointed-leaved pondweed

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Pointed-leaved pondweed
Pointed-leaved pondweed (Potamogeton acutifolius)

Pointed-leaved pondweed ( Potamogeton acutifolius )

Systematics
Class : Bedecktsamer (Magnoliopsida)
Monocots
Order : Frog-spoon-like (Alismatales)
Family : Pondweed family (Potamogetonaceae)
Genre : Spawn herbs ( Potamogeton )
Type : Pointed-leaved pondweed
Scientific name
Potamogeton acutifolius
Link ex Roem. & Schult.

The pointed-leaved pondweed ( Potamogeton acutifolius ) is a species of the genus pondweed ( Potamogeton ) within the family of the pondweed plants (Potamogetonaceae). This aquatic plant is widespread in Europe .

description

illustration

The pointed-leaved pondweed is a perennial herbaceous plant that reaches heights of 30 to 60 centimeters. It becomes very brittle in autumn. Their rhizome is attached to the mud with a tap root. The stem is flat and wingless. The leaves are green, 1.5 to 4.5 millimeters wide, often pointed long, three to rarely five-nerved; often provided with one or two distinct, blackish cusps on the leaf base, which form white secondary roots, especially in muddy water. The ligule is up to 2 centimeters long.

The flowering period extends from June to August. With a length of 0.5 to 5.5 centimeters, the inflorescence stem is hardly longer than the ear. Four to six flowers stand together in a 2.5 to 5.5 centimeter long spike inflorescence . The flowers have a diameter of about 1.5 millimeters.

The fruits are 3 to 4 mm long and 2.3 to 3 mm wide, clearly and almost straight beaked.

Turions are seldom formed.

The chromosome number of the species is 2n = 26.

ecology

The slit-leaved pondweed is an aquatic plant , a hydromorphic hydrophyte . The slit-leaved pondweed shows strong population fluctuations .

Occurrence

The slit-leaved pondweed is widespread in Europe and occurs as far as the Caucasus. Their main occurrence is in Central Europe; there their distribution area extends from southern England via France to western Russia . The southern border of the distribution runs from southwest France over central Italy to Bulgaria , seen from here you can find it north of the Black Sea to the Volga plate . The northern limit of the settlement is in southern Sweden at approx. 60 ° north latitude.

The slit-leaved pondweed grows in standing or slowly flowing, alkaline - and sometimes also lime-rich , meso to slightly eutrophic waters, it tolerates short-term winter dehydration. It is rooted in ponds , rare in backwaters and trenches, preferably about Gyttja - floors in 0.3 to 1.6 meters of water. It is a character species of the Potamogetonion association.

literature

  • Otto Schmeil , Jost Fitschen (greeting), Siegmund Seybold: The flora of Germany and the neighboring countries. A book for identifying all wild and frequently cultivated vascular plants. 95th completely revised u. exp. Edition. Quelle & Meyer, Wiebelsheim 2011, ISBN 978-3-494-01498-2 .
  • Rothmaler : Excursion flora from Germany, vascular plants: basic volume. 20th edition, 2011, Spektrum Verlag Heidelberg, ISBN 978-3-8274-1606-3 .
  • Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= the fern and flowering plants of Germany. Volume 2). 2nd, corrected and enlarged edition. Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2007, ISBN 978-3-8001-4990-2 .
  • Oskar Sebald, Siegmund Seybold , Georg Philippi, Arno Wörz (eds.): The fern and flowering plants of Baden-Württemberg. Volume 7: Special part (Spermatophyta, subclasses Alismatidae, Liliidae Part 1, Commelinidae Part 1): Butomaceae to Poaceae. Eugen Ulmer, Stuttgart 1998, ISBN 3-8001-3316-4 .

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Page 103. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
  2. ↑ Rafaël Govaerts (Ed.): Potamogeton acutifolius. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 14, 2016.

Web links

Commons : Pointed Laichkraut ( Potamogeton acutifolius )  - Collection of pictures, videos and audio files